22187898 has 32 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 7362000.

The previous prime is 22187881. The next prime is 22187899. The reversal of 22187898 is 89878122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22187899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12736 + ... + 14372.

It is an arithmetic number, because the mean of its divisors is an integer number (1547910).

Almost surely, 2^22187898 is an apocalyptic number.

22187898 is an abundant number, since it is smaller than the sum of its proper divisors (27345222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22187898 is a wasteful number, since it uses less digits than its factorization.

22187898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 22187898 is about 4710.4031674582. The cubic root of 22187898 is about 280.9993963252. Note that the first 3 decimals are identical.

The spelling of 22187898 in words is "twenty-two million, one hundred eighty-seven thousand, eight hundred ninety-eight".